In 11 test runs a brand of harvesting machine operated for 10.1, 12.2, 12.4, 12.4, 9.4, 11.2, 14.8, 12.6, 10.1, 9.2, and 11.0 h on a tank of gasoline. (a) Use the Wilcoxon signed rank test to...

In 11 test runs a brand of harvesting machine operated for 10.1, 12.2, 12.4, 12.4, 9.4, 11.2, 14.8, 12.6, 10.1, 9.2, and 11.0 h on a tank of gasoline.

(a) Use the Wilcoxon signed rank test to determine whether the machine lives up to the manufacturer’s claim of an average of 12.5 h on a tank of gasoline.

(Use α = 0:05.)

(b) For the sake of comparison, use the one-sample t test and compare results. Comment on which method is more appropriate.